Electrical connecter



Aug. 4;l 193i. w. H. HARVEY 1,316,846

' ELECTRICAL ormcran Fied my 21, 1930 /N VE N TOR .WHHARVEV By y wwwArto/awa Patented Aug. 4, 1931 Unirse STATES PA'FEN'II OFFICE WILLIAM H.HARVEY, F BROOKLYN, NEWy YORK, ASSIGNOR TO BELL TELEPHONE LABORATORIES,INCORPORATED, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK Applicationfiled May 21,

y This invention relates to electrical connecters and more specificallyto a tool for making test connections to windings of electroniagnets andthe like.

e In telephone exchanges, for example, '1t is customary to test circuitsby connecting test sets to the winding terminals of relays and otherelectrical apparatus.

The object of this invention is to provide l@ a tool which can beapplied to the relay winding terminals without danger of closingcircuits to the test set by accidental contact of the tool with metalparts while and before it is connected to the winding terminal.

According to this invention a mounting block which is made of insulatingmaterial supports a rodhaving at one end hook portion for engagementwith one ol the re- 2@ lay winding terminals. This rod slides freely ina bearing portion at one end of the block and is provided with a contactelement in the form of a pin which engages a compression spring fortensioning it upon a movement of the block relative to the rod and foreffecting contact with another contact element in the form of a lealspring mounted on the block. A cord terminal at y y one end of the blockis provided for secur 3G ing the leaf spring in place and tor holdingrit firmly against abutting shoulders in the block in engageablerelation with the pin at the end of the rod and means cooperating in thecompression spring is provided for holding the tool in adjusted positionon the relay during the operation., the engagement of the contactelement with the leaf spring being eii'ective to establish circuitconnection from the terminal of the 4 relay to the cord terminal of thetesting set.

In the drawings, Fig. 1 is a side view of the tool shown mounted on arelay. Fig. 2 is a front view showing the mounting block in section andthecontacts in the engaged position. Fig. 3 is another front viewshowing the mounting block in section and the contacts in the disengagedposition, and Fig. 4: is a sectional view taken approximately on line4me of Fig.

Through the several gures 9 is a bloeit of ELECTRICAL CONNECTER 1930.serial No. 454,497.

insulating material having a centrally disposed countersunk hole 10 inwhich a rod 11 is slidably mounted. This rod carries at one end a pin 12which engages the end cfa compression spring 13 mounted on the rod 11.The other end of spring 13 engages a shoulder portion 14 in the block 9.The rod 11 is held in a retracted position against the tension of'spring 13 by an abutting piece 27 projecting from the end ost a cordterminal 18 in turn secured in the ends of the bloeit 9 by pin 19. Thisblock is provided at one side with longitudinal grooves 15 and 15 ofdifferent widths and arranged to form shoulder portions on each side ofgroove 15 as shown in Figs. 1 and e for a purpose that will behereinafter described in detail. The groove 15 is provided for guidingthe pin 12 upon the movement of block 9 relative to the rod 11 and forpreventing the rotary movement of this rod with respect to the block.

In the groove 15 is mounted a leaf spring 16 which is held in positiontherein by a nut screw 17 engaging the threaded portion ot plug 18. Thespring 16 is normally so tensioned that its free end eilccts a certainpressure on the shoulder portions formed by the grooves 15 and 15 theseshoulder portions cooperating with each other to hold this spring inproper engageable relation with the contacting pin 12.

On one face of block 9 there is mounted a metallic plate 2O which issecurely held thereon by a number of rivets such as 21. This plate isprovided one end with a tooth 22 and at its other end with a hookportion 23 which is also provided with a tooth 241.

The rod 11 is provided atk its free end with a flattened portion 26which is bent substantially at right angles with respect to thelongitudinal axis of the rod and is provided with a notch 25 arrangedfor engagement with either one of the terminals T of relay R showndiagrammatically in Figs. 1 and 2.

In a typical testing operation the hook portion 26 at the end of rod 11is engaged with the relay terminal of the relay R as shown in Figs. 1and 2 between the spoolhead 30 andbaseplate'l. The mounting block 9 isthen pulled rearwardly to compress the spring 13 until the projectingtooth 22 of the plate 12 clears the front spoolliead 32 of the relay R.Upon the release ofthe block 9 Vthisl tooth is caused to produce anindentation into the spoclhead under the tension of spring 13 wherebythe tool is po'sitively'held in position 'on the relay. Thel movement ofbar 11 from the position shown in Fig. 3 to the position shown in Figs.l and 2 is elfective' to move the pin 12 in engagement with the leafspring' 16 and thereby establishing electrical connectionfrom the relaywinding terminal to th-e plug 18, this plug being adapted to connectwith the cord of the testing set, 'not shown, in a Well known'manner.VThe removal of thetool from the relay is effected by pulling the block 9rearwardly a clistance suflicient for disengaging the hoo-k 22 from thespoolhead 32 of the relay, this block being returned in normal positionwith respect to the rod by the tension of spring 13 in the manner abovedescribed.

` The combination of contact spring 16 and guide pin 12 constitutes aswitch for connecting and disconnecting the contact rod l1 .from therelay terminal T as desired.

This is lforthe purpose of preventing acci'- dental closure of circuitfrom adjacent metal parts to the test set while connecting the tooltothe relay terminal since the space between therelay terminal and returnpole piece is very restricted in this apparatus.

Since the test circuit is maintained open by the tool until it is set inplace on the relay terminal, no circuits can be closed due to the part26 touching adjacent metal parts.

lVhat is claimed is :y y

A tool for making test connection to winding terminals of relayscomprising a mounting block, a .member arranged for movement in saidblock7 means carried by said member for engagement withthe terminals ofsaid relay, means carried by said block for engagement with thespoolhead of said relay, a spring tensioned by the movement of saidblock with respectV to said member for holding the tool in position onthe relay and` switch means actuated by the movement of said member. Y

rIn witness whereof, l hereunto subscribe my name, this 19th day ofMay,l 1930.

- WILLIAM H. HARVEY.

